Feeding mechanism fob shaker



framework guiding tape from said spools to the unit arranging means, and moistening means on said framework for engaging the gummed tape, said moistening means comprising a first moistener adjacent to each spool adapted to initially moisten the tape, and a second moistener for each tape spaced a substantial distance along the path of movement of the tape from the first moistener and adjacent to the arranging means, and manually operable means for moving each moistener out of engagement with the tape.

8. A method of securing a plurality of envelopes, sheets, cards and like members together in overlapped relation, which comprises holding each thereof stationary while moving another thereof across the same to engage its forward edge with an abutment spaced the amount of the overlap from the forward edge of the held member, clamping said members together against relative movement, and pres-sing the positioned envelopes, sheets, cards and the like while so clamped against a previously moistened gummed tape and advancing them with the tape the amount of the overlap.

9. A method of securing a plurality of envelopes, sheets, cards and like members together in overlapped relation, which comprises holding each thereof stationary while moving another thereof across the same to engage its forward edge with an abutment spaced the amount of the overlap from the forward edge of the held member, clamping said members together against relative movement, moving said abutment out of the path of said clamped members, and advancing them the amount of overlap and pressing a previously moistened gummed tape to each envelope, sheet, card and the like, while held against such relative movement.

10. A method of securing a plurality of envelopes, sheets, cards and like members together in overlapped relation, which comprises holding each thereof stationary while moving another thereof across the same to engage its forward edge with an abutment spaced the amount of the overlap from the forward edge of the held member, clamping said members together against relative movement, moving said abutment out of the path of said clamped members, and advancing 10 them the amount of overlap and pressing a previously moistened gummed tape to each envelope, sheet, card and the like, while held against such relative movement but before it is advanced.

11. A method of securing a plurality of envelopes, sheets, cards and like members together inoverlapped relation, which comprises holding each thereof stationary while moving another thereof across the same to engage its forward edge with an abutment spaced the amount of the overlap from the forward edge of the held member, clamping said members together against relative movement, moving said abutment out of the path of said clamped members, and advancing them the amount of overlap and pressing a previously moistened gummed tape to each envelope, sheet, card and the like, while held against such relative movement and after it has advanced and before the next one is engaged with said abutment.

12. In a machine of the character described having means to arrange units such as envelopes, sheets, cards and the like in overlapped relation with a like portion of each unit beneath the top one exposed to receive a legend, means to secure the units together as they are so arranged, comprising a pair of members comprising part of said arranging means relatively movable to clamp said units between the same, and means for moistening a gummed tape and feeding said moistened tape between one of said members and said units to press said units and tape into engagement upon said members reaching unit clamping position.

ARTHUR L. HESS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,632,433 Christman, Jr June 14, 1927 2,205,433 Paulsen June 25, 1940 2,222,983 Marchev et al Nov. 26, 1940 2,288,149 Williams June 30, 1942 2,338,058 Read Dec. 28, 1943 2,363,417 Heywood Nov. 21, 1944 p 1943- .12 H. HOLSTEIN I FEEDING MECHANISM FOR SHAKER CONVEYERS 4 sheets-sheet 1 Filed June 21, 1946 ull Sept. 21, 1948. .11. H. HOLSTEIN FEEDING MECHANISM FOR SHAKER CONVEYERS 4 Sheets-Sheet 3 Filed June 21, 1946 Sept, 21, 1948. v .1. H. HOLSTEIN 2,449,777

' FEEDING MECHANISM FOR SHAKER CONVEIERS Filed June 21, 1946 4 Sheets-Sheet 4' mwfilat Q attorney Patented Sept. 21', 1948 FEEDING MECHANISM FOR SHAKER CONVEYERS John H. Holstein, Chicago, 11]., assignor to Goodman Manufacturing Company, Chicago, 111., a corporation of Illinois Application June 21, 1946, Serial No. 678,379 18 Claims. (01. 198-220) This invention relates to improvements in'feeding mechanisms for extensibly or retractibly' moving an extensible trough and shovel of a shaker conveyor, and more particularly relates to a new and improved form of fluid operated means for operating the grip blocks of the feeding mechanism.

The principal objects of my invention are to provide a novel form of friction grip feeding device for extensibly or retractibly moving an extensible trough of a, shaker conveyor, including a new form of hydraulically operated means for efllciently engaging the grip blocks of the feeding device with the extensible trough during alternate strokes of the conveyor, and so arranged as to' assure a uniform gripping action on each side of the extensible trough for-the full stroke of the conveyor.

Another object of my invention is to provide a hydraulically operated feeding device for the extensible trough of a shaker conveyor having a a shaker conveyor including a novel form of operating and control means operated bythe action of the conveyor for controlling the supply and release of fluid to and fromthe grip block operating mechanism.

These and other objects of my invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawings wherein:

Figure 1 is a fragmentary plan view of a feeding mechanism constructed in accordance with my invention, shOWn as being connected between the reciprocating and extensible troughs of a shaker conveyor, with certain parts of the extensible trough broken away and certain parts of the feeding mechanism shown in horizontal section;-

Figure 2 is a view in side elevation of the feeding mechanism shown in Figure 1, with certain parts thereof shown in substantially longitudinal section;

. Figure 3 is an enlarged fragmentary transverse sectional view taken substantially along line 3-4 of Figure 1;

Figure 4 is an enlarged fragmentary transverse sectional view taken substantially along line 4-4 of Figure 1;

Figure 5 is an enlarged detail longitudinal sectional view showing certain details of the valve means for supplying fluid under pressure to the feeding device, during alternate strokes of the conveyor;

Figure 6 is a detail view showing the operating means for the valve means for supplying fluid under pressure to the feeding device in a different operative position than in Figure 5;

Figure 7 is an enlarged detail transverse sectional view showing certain details of the control for the valve means not shown in Figures 5 and 6;

Figure 8 is a fragmentary sectional view taken substantially along line 8-8 of Figure 2, showing certain details of the overload release valve. for

the feeding device;

Figure 9 is a diagrammatic view showing the fluid diagram for supplying fluid under pressure to the grip blocks to operatethe feeding mechanism, with the control valves therefor in a neutral position; and

Figure 10 is a fluid diagram showing the control of said frame.

valves in a position to retractibly move the extensible trough of the conveyor.

In the drawings, the main elements of the invention illustrated include a reciprocating trough I0 having an extensible trough ll mounted for extensible or retractible movement .with respect thereto. Said extensible trough has a flared gathering shovel 12 at its forward end for picking up loose material from the ground. Said reciprocating trough is connected to the inlay end of a shaker conveyor trough line through a swivel (not shown), to permit lateral movement of said reciprocating and extensible troughs, so as to enable the shovel to pick up loose material from the far corners of a working face of a mine, as disclosed in Patent No. 2,360,169, which issued to W. W. Sloane Oct. 10, 1944.

A frame I3 connected at its rear end to the swivel extends beneath the reciprocating and extensible troughs and serves to move said troughs laterally about said swivel on lateral movement Said frame is shown in a companion application Serial No. 678,378, filed herewith, now Patent No. 2,435,139, issued Jan. 2'7, 1948, so need not herein be described further except to point out that it is non-reciprocating during reciprocable movement of the conveyor and forms a support for the drive means for laterally moving said frame and extensible and reciprocating troughs about the swivel by power.

The extensible trough II is supported on the ground at its forward end on the shovel l2 and is supported above the ground at its rear end on a bearing shoe (not shown) in the manner shown in the aforementioned Patent No. 2,360,169, and has a bearing plate I! extending along each upper outer side thereof and projecting laterally therefrom. Said bearing plates have the forward end of the reciprocating trough ill slidably supported thereon, and extend between spaced follers Ii, l8

mounted in upwardly and forwardly extending support portions l1, H of side walls l8. I! of a frame 20. Said frame is secured tothe forward end of the reciprocating trough i and extends forwardly of said trough and across the bottom thereof and upwardly along opposite sides thereof (see Figures 1 and 2). Laterally spaced rollers 2|, 2| are mounted in depending outer wall portlons 22, 22 of said frame. Said rollers have V- shaped engaging surfaces and are adapted to engage guide tracks 23, 28 extending along the outer sides of the frame I3, to form a means for supporting the forward end of said frame above the ground on said reciprocating trough,-as shown and described in my aforementioned companion application.

The bearing plates l5, ii are also adapted to be engaged by friction grip blocks 25, 25 mounted in carrier members 21, 21, the grip blocks 25, 25 engaging the top faces of said bearing plates and the grip blocks 26, 28 engaging the bottom faces of said bearing plates. The carrier members and means for engaging said grip blocks with said bearing plates on each side of the extensible trough II are of a similar construction, so a description of said feeding mechanism for one side of said extensible trough will be suflicient for both sides thereof.

The carrier member 21 is connected with the forward end of the support l1 by means of a yieldable link 29, the longitudinal axis of which extends substantially in alignment with the central longitudinal axis of the bearing plate i5, so as to take the thrusts imparted by said extensible trough between the grip blocks 25, 28 inthe plane of the longitudinal axis of said bearing plate. Said yieldable link normally acts as a solid member and includes an eyebolt 30 extending through said carrier member and slidably'mounted in a pin 32 extending transversely of said carrier member. Said pin is pivotally mounted in said carrier member for movement about a transverse axis. A nut 3| is threaded on the outer end of said eyebolt and abuts a collar 38 slidably mounted on said rod and abutting said pin 32, to hold said eyebolt-to said carrier member and pin (see Figure 1). The inner end of said eyebolt is pivotally connected to the support l1 by means of a pivotal pin 33. A spring 34 encircles said eyebolt and abuts a flange 35, herein shown as being formed integrally with said eyebolt and disposed adjacent the eye thereof. The opposite end of said spring abuts a flange 36 of a flanged sleeve 31, which sleeve is mounted in said carrier member at its inner end and is slidably mounted on said rod. Said spring is preloaded to act as a solid member during extension 01 the trough H, and to yield when the forward end of the shovel l2 engages an obstruction on the ground. When the forward end of said shovel engages an obstruction on the ground, said spring will yield during the forward strokes of the conveyor and will allow the carrier member 21 to move rearwardly against said spring.

An overload fluid release means is provided in the lower end of said carrier member, to release fluid from a cylinder herein shown as being formed integrally with'the lower end of said carrier member, and to release said grip blocks from said bearing plate during the forward strokes obstruction on the ground. Said release means, as herein shown, includes a piston Y valve ll mounted in a head 42 for said cylinder and having a stem 43 projecting forwardly from said carrier member. The end of said valve stem is adapted to be engaged by the lower end of an operating lever 44. Said lever is pivotally.

mounted intermediate its ends in a bifurcated support 45, which projects forwardly from said carrier member. The opposite end of said operating lever is adapted to engage the end of the eyebolt 30. Said end of said operating lever is engaged with said eyebolt 30 by means of a spring 45, mounted in the chamber for said valve ll, and engaging said valve, to hold said valve in position to admit fluid under pressure to said cylinder 40.

When overload conditions are encountered and the carrier member moves along the eyebolt 30 towards the support l1, said eyebolt engaging said lever arm at its upper end, will pivot said lever arm in a counterclockwise direction by relative movement between said carrier member and eyebolt. to move the valve ll into position to release fluid from the cylinder All and to block'fluld under pressure from entering said cylinder, as will hereinafter more clearly appear as this specification proceeds.

The cylinder 40 has a piston .41 slidably mounted therein. The upper portion of said piston has an annular recess 48 formed therein and opening towards the top of said piston. Said annular recess is adapted to form a seat for a spring 49. The upper end of said spring engages an annular ring 50 abutting the bottom of an annular ring 5| suitably secured to the inside of said cylinder and extending inwardly therefrom so as to move said piston in a direction to expel fluid'from said cylinder when fluid pressure is released therefrom. The portion of said piston surrounded by said annular recess has an arcuate recess 58 formed therein (see Figure 2). Said recess opens towards the top of said piston and is adapted to receive an arcuate lug 54 depending from the lower grip block 26, so that when fluid under pressure is admitted to the lower end of said cylinder through a port 551eading from the chamber of the relief valve 41, said piston will positively engage said grip blocks 25 and 2G with opposite sides of the bearing plate l5, and when fluid pressure is released from said cylinder the spring 49 will move said piston in a direction to release said grip blocks from said bearing plate.

Fluid under pressure is supplied to the cylinders I0, 40 during alternate strokes of the conveyor, by means of a piston valve 56 operated by a control lever 51 (see Figure 5). Said control valve is adapted to supply fluid under pressure to or to release fluid from either one of two alternately operable poppet valves 59 and 60. Said poppet valves are operable by reciprocable motion 'of the conveyor and are connected to the cylinders 40,

40 to supply fluid under pressure thereto during either the forward or return strokes of the conveyor, depending upon the direction it is desired to feed the extensible trough, and to release fluid from said cylinders during the opposite strokes of the conveyor.

The piston valve 56 includes a valve block 6|, herein shown as being mounted on a side wall [9 of the frame 20. A valve piston 63 is slidably movable in a valve chamber 64 extending longitudinally of said valve block. A valve stem 65 extends from said valve piston outwardly of said valve block, and is connected to the control lever 51 by means of a link 08. Said control lever is transversely pivoted at its lower end on a pivotal pin 61 mounted at its ends in a bifurcated support 88 extending outwardly from a support frame 69, which is secured to the outer side wall I! of the frame 20 and forms a support for the valves 59 and 80 and the operating means therefor (see' Figures 3 and 7). YA spring pressed detent Ill is adapted to engage either one of a plurality of depressions II, II formed in the lower end'of said control lever, for holding said control lever in anyone of its various operating positions.

When the detent III is in engagement with the central depression 'I I, as in Figure 5, the control lever 51 and the valve 56 will be in a neutral position and fluid under pressure will pass through said valve to the cylinder 40 through a pipe 12,

through a pipe I3. When said control lever is in the position shown in Figures 6 and 10, said poppet valve 60 will supply fluid under pressure to the cylinders 40,- lll during the return strokes of the conveyor, to retract said extensible trough within said reciprocating trough. In this position of said control lever fluid will be released from said cylinders during the forward strokes of the conveyor by means of the poppet valve 59.

When the detent I is in engagement with the upper depression II, the control lever 51 will be in a forwardly inclined position and will move the piston of the valve 68 in position to supply fluid under pressure ,to the pressure inlet side of the poppet valve 59 through a pipe 14. When said control lever is in this position, said poppet valve will supply fluid under pressure to the cylinders 40, 40 during the forward strokes of the conveyor to extend said extensible trough from said reciprocating trough. In this position of said control lever fluid will be released from said cyli'nders during the return strokes of the conveyor by means of the poppet valve 60.

The poppet valves Hand 60 face each other and 'are each of the same construction, so the same part numbers will be given to each of said valves. A plunger I extends from the stem of each of said valves. Said plungers face each other and are adapted to be engaged by opposite sides of a block I6, which is mounted on the,

upper end of a rod I1. Said rod is slidably mounted in a trunnion block 18, which is trunnioned' in trunnion supports 89, 89 depending from the frame 69 (see Figure 7). A head 8i formed on the llower end of said rod is transversely pivoted to an engaging shoe I9. Said shoe is adapted to engage a bearing plate 80 secured to and extending outwardly from the non-reciprocating frame I3. A spring 82 encircles said rod 11 and is interposed between said 'trunn-ion block and said bifurcated lower end I6 is moved into position to operate the valves 6 "and I to supply fluid to the cylinders ll, ll during either the forward or return strokes of the conveyor, by means of a pair of parallel spaced links 83, ll. Said links are pivoted adjacent their upper ends to opposite sides of the control lever, and are pivotally connected adjacent their lower ends to the upper ends of opposite upright sides 84, 84 of said shoe. Play is provided in the connections between said links and said control lever to permit thespring II to yieldably engage said shoe with said bearin plate.

Frictional resistance between the shoe I! and bearing plate during reciprocation of the conveyor. will cause the trunnion block I. to reciprocably move and pivot said rod about its axis of pivotal connection to said shoe, to open the poppet valve 89 during-the forward strokes of the conveyor and open the poppet valve '0 during the return strokes of the conveyor. Said poppet valves are both moved to closed positions by means of springs 8!, l8 encircling valve stems 86, 8B projecting from the pressure outlet sides of said valves. It should here be understood that the poppet valves 58 and II are operated in the same order when the control lever 51 is in a forwardly extended position or a. rearwardly extended position, and that the supplyo f fluid under pressure to the cylinders l0, l0 during either the forward or return strokes of the con-- veyor is controllled by the valve 50.

Referring now to Figures 9 and- 10 and the fluid connections for supplying fluid to and releasing it 'i'romthe cylinders 40, 40 during alternate strokes of the conveyor, afluid storage tank- 91 serves as a source of fluid'supply for a pump 99.. Said tank and pump may be mounted on the stationary base of the swivel (not shown).

Said swivel may be connected to the rear .end

of the reciprocating trough Ill, as inthe aforementioned Sloane Patent No. 2,360,169. A pipe 7 I00 connects said pump with a central port iii of pipe I00 when said piston valve and the control lever 51 are in a neutral position. Said pipe I01 is connected with ports I08, I08 formed in the bottoms of the cylinders 40, 40., 7 Each of said ports leads to a valve chamber I09 of the relief valve 4|, for supplying fluid under pressure thereto. Said chambers are each connected to supply fluid under pressure to the cylinder 40 through the port 55. A port H2 leads from each valve chamber I09. Said ports are normally closed by the valve II and-only open when the extensible trough engages an obstruction during the forward strokes of the conveyor. Said ports are connected with a return line Ill, for returning fluid to the tank 81 upon the opening of said relief valves II, M.

The pipe I3 leads from the block iii of the piston valve 66 to the pressure side of the poppet valve 80. A pipe H5 leads from the outlet side of-said poppet valve and is connected to the pipe II", to supply fluid under pressure to the cylinders 40, 40 during the return strokes of the conveyor. A pipe Hi leads from the end of the valve block ii opposite the control lever 51, for

returning fluidto the tank 91, which is released from the cylinders 40, Ill through the poppet valves 59.

The pipe 14 leads froni the opposite side of the valve block 6! from the pipe I3. and is connected with the pressure intake side of the poppet valve 59. A pipe I" leads from the outlet side of said poppet valve to the pipe I01 for supplying fluid under pressure to the cylinders 40, 40 during the forward strokes of the conveyor.

When the control lever 51' is in the neutral position shown in Figure 9, the links 83, 83 will lift the shoe I9 out of engagement with the bearing plate 80. The valve 58 will be in a neutral position and fluid under pressure will pass through said valve and the pipe 12 to supply fluid to'the two cylinders 40, 40. In this position of said control lever, fluid will be supplied to the cylinders 40, 40 during both the forward and return strokes of the conveyor, to engage the grip blocks 25, 26 with the bearing plates l5, l during both the forward and return strokes of the conveyor and reciprocably move the extensible trough II with the reciprocating trough Hi.

When the control lever 51' is in the rearwardly inclined position shown in Figure 3%, fluid under pressure will be supplied to the chamber of the valve 56 through a passageway I I9 formed in the block of said valve, and out from said valve through the'pipe 13 to the pressure side of the poppet valve 60. The shoe 19 will also be in engagement with the bearing plate 80 and relative movement-between the valves 59 and and said shoe and bearing plate during reciprocation of the conveyor, will cause the block 16 on the upper end of the rod TI to depress the plunger of the valve 60, during the return strokes of the conveyor, to open said valve to supply fluid under pressure to the cylinders 40, 40, to engage the grip blocks 25 and 26 with the bearing plates l5, [5 during the return strokes of the conveyor. During the forward strokes of the conveyor the block 16 will depress the plunger 15 of the valve 59, to open said valve and release fluid from the cylinders 40, 40 and permit the springs 49, 49 to move the pistons 41, 41 in a direction to release said grip blocks from said bearing plates. This will retr'actibly move said extensible trough with respect to said reciprocating trough. Fluid is released from said valve 59 during the return strokes of the conveyor through the pipe 14, cross drilled passageways I in the valve piston 63 adjacent the pipe I4, and central passageway H! in said valve piston leading from said cross drilled passageways'and opening to the right hand end of said piston, and out of the chamber of said valve 56 to the tank 91 through the pipe H8.

When the control lever 51 is in a forwardly inclined position, to effect extension of the exform in which my invention maybe embodied. it will be understood that the construction thereof and the arrangement of the various parts may be altered without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting my invention to the specific embodiment illustrated, excepting as it may be limited in the appended claims.

. I claim as my invention:

1. In .a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyor, fluid operated means for moving said grip blocks to a gripping position to engage said other trough, valve means for supplying fluid under pressure to and releasing fluid from said fluid operated means during alternate strokes of the conveyor, and means for operating said valve means includ ing a shoe, a control lever for moving said shoe into position to cause relative movement between said valve means and said shoe during reciprocation of the conveyor, and an operative connec tion between said shoe and said valvemeans.

2. In-a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyor, fluid operated means for moving said grip blocks to a gripping position to engage said other trough, valve means for supplying fluid under pressure to said fluid operated means during alternate 1 strokes of the conveyor, a control valve for contensibie trough II from the reciprocating trough ill, the valve piston 63 of the valve 56 will be moved to a position to admit fluid under pressure to the pressure intake side of the popp t valve 59 through the pipe 14. between said valve 59 and the bearing plate 80 and shoe 19 will cause the block 16 on the upper Relative movement and of said rod 11 to depress the plunger of said valve 59 during the forward strokes of the conveyor, to open said valve and supply-fluid under trolling the supply .of fluid under pressure to and the release of fluid from said valve means, a control lever for operating said control valve, a'shoe, a connection between said shoe and said control lever for moving said-shoe into position to cause relativelmovement between said valve means and said shoe during reciprocation of the conveyor, and an operative'connection betWeen said shoe and said valve means.

3. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks'reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for moving said grip blocks into engagement with said other trough, two alternately operable valves for supplying fluid to and releasing fluid from said fluid operated means during alternate strokes of the conveyor,

I means operable by relative movement between said valves and the ground for alternately operating said valves,- and a third valve operable to supply fluid to one of said two valves during one of the strokes of the conveyor and to release fluid lama-iv from the other of said two valves during. the opposite strokes of the conveyor.

4. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for moving said grip blocks into engagement with said other trough, two alternately operable valves for supplying fluidto and releasing fluid from said fluid operto release fluid from said one valve during the forward strokes of the conveyor, and means operable by movement of said control lever in position to move said third valve into position to supply fluid to either one of said two valves and by relative movement between said reciprocating trough and .the ground for alternately operating said two valves.

5. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for moving said grip blocks into engagement with said other trough, two alternately operable valves for supplying fluid to and releasing fluid from said' fluid operated means during alternate strokes of the conveyor, a third valve, a, control lever for moving said third valve into position to supply fluid to one of said two valves during the forward strokes of the conveyor and to release fluid from the other of said valves during the return strokes of the two alternately operable valves for supplying fluid to and releasing fluid from said fluid operated means during alternate strokes of the conveyor, a third valve, a control lever for moving said third valve into position to supply fluid to one of said two valves during the forward strokes of the conveyor and to release fluid from the other of said valves during the return strokes of the conveyor, and to supply fluid to said other valve during the return strokes of the conveyor and release fluid from said one valve during theforward strokes of the conveyor, and means operable by relative movement between said reciprocating trough and the ground for alternately operating said two valves when said control lever is in position to move said second valve into position to supply fluid to either one of said two valves including a non-reciprocating bearing plate, a shoe movable into position to engage said plate upon movement of said control lever into one operative position or the other, and a member having slidable connection with said reciprocating trough and pivotal connection with said shoe and having operative connection with said valves for alternately operating said valves upon relative movement between said reciprocating trough and said shoe.

7. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for moving said grip blocks into engagement with said other trough, two alternately operable valve means for supplyingfluid to and releasing fluid from said fluid operated means during alternatestrokes of the conveyor, a third valve, a control lever for moving said third valve into position to supply fluid toone of said two valves during the forward strokes of the conveyor and to release fluid from the other of said valves during the return strokes V of the conveyor, and to supply fluid to said other conveyor, and to supply fluid to said other valve during the return strokes of the conveyor and release fluid from said one valve during the forward strokes of the conveyor, and means operable by relative movement between said reciprocating trough and the ground for alternately operating said two valves when said control lever is in position to move said third valve into position to supply fluid to either one of said two valves including a non-reciprocating bearing plate, a shoe movable into position to engage said plate upon movement of said control lever into one operative position or the other, and means connected with said shoe and opei'ated by relative movement between said valves and shoe for alternately operating said valves upon reciprocable movement of the conveyor.

6. In a feeding device for shaker conveyors, a reciprocatingtrough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for moving said grip blocks into engagement with said other trough,

valve during the return strokes of the conveyor and release fluid from said one valve during the forward strokes of the conveyor, and means operable by relative movement between said reciprocating trough and the ground for alternately operating said two valves when said control lever is in position to move said third valve into position to supply fluid to eitherone of said two valves including a non-reciprocating bearing plate, a shoe movable into position to engage said plate upon movement of said control lever into one operative position or. the other, means for holding said shoe in yieldable engagement with said bearing plate when said control lever is in position to extend or retract said extensible trough, and means connected with said shoe and operated by relative movement between said reciprocating trough and shoe for alternately operating said valves.

8. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for-moving said grip blocks into engagement with said other trough,

11 two longitudinally spaced facing poppet valves for supplying fluid to and releasing fluid from said fluid operated means during alternate strokes of the conveyor, a third valve, a control lever for moving said third valve into position to supply fluid to one of said pQDpet valves during the forward strokes of the conveyor and to release fluid from the other of said poppet valves during the return strokes of the conveyor, and for moving said third valve into position to supply fluid to the other of said poppet valves during the return strokes of the conveyor and to'release fluid from said one poppet valve during the forward strokes of the conveyor, and means controllable by said control lever and operable by relative movement between said reciprocating trough and the ground for alternately operating said poppet valves when said control lever is in position to cause fluid to be supplied to either one of said poppet valves,

including a reciprocably moving engaging member disposed between and having operative connection with said poppet valves.

9. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement of the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageable with the other of said troughs during alternate strokes of the conveyor, fluid operated means for moving said grip blocks into engagement with said other trough, two longitudinally spaced facing poppet valves for supplying fluid to and releasing fluid from said fluid operated means during alternate strokes of the conveyor, a third valve. a control lever for moving said third valve into position to supply fluid to one of said poppet valves during the forward strokes of the conveyor and to release fluid from the other of said poppet valves during the return strokes of the conveyor,

and for moving said third valve into position to supply fluid to the other of said poppet valves during the return strokes of the conveyor and to release fluid from said one poppet valve during the forward strokes of the conveyor, and means controllable by said control lever and operable by relative movement between said reciprocating trough and the ground for alternately operating said poppet valves when said control lever is in position to cause fluid to besupplied to either one of said poppet valves, including a reciprocably moving engaging member disposed between and having operative connection with said poppet valves, a non-reciprocating bearing plate, a shoe V fluid under pressure to said cylinders to engage the conveyor, a third valve, a control lever for moving said third valve into position to supply fluid to one of said poppet valves during the forward strokes of the conveyor and to release fluid from the other or said poppet valves during the return strokes of the conveyor, and for moving said third valve into position to supply fluid to the other of said poppet valves during the return strokes of the conveyor and to release fluid from said one poppet valve during the forward strokes of the conveyor, and means controllable by said control lever and operable by relative movement between said reciprocating trough and the ground for alternately operating said poppet valves when said control lever is in position to cause fluid to be supplied to either one 01' said poppet valves.

including a reciprocably moving engaging mem- I means for moving said extensible trough relative I to said reciprocating trough including two triction grip blocks reciprocably moved by one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyor, a separate cylinder and piston for each set of said grip blocks for moving said grip blocks to a gripping position, a valve operable to supply fluid under pressure to said cylinders to engage said grip blocks with said other trough during the forward strokes of the conveyor, another valve operable to supply said grip blocks with said other trough during the return strokes of the conveyor, said first mentioned valve being operable to release fluid pressure from said cylinders during the forward strokes of the conveyor when said second mentioned valve is operable to supply fluid under pressure to said cylinders during the return strokes of the conveyor, to retractibly move said extensi bie trough, and vice versa when it is desired to movable into engagement with said plate when said control lever is in position to extend or retract said extensible trough.- and an operative connection between said shoe and said engaging member for reciprocably moving said engaging member upon reciprocable movement of the conveyor.

10. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means operated by reciprocable movement oi the conveyor for moving said extensible trough relative to said reciprocating trough including two friction grip blocks reciprocably moved by one of said troughs and engageabie with the other of said troughs during alternate strokes of the. conveyor, fluid operated means for moving said grip blocks into engagement with said other trough, two longitudinally spaced facing poppet valves for supplying fluid to and releasing fluid from said fluid operated means during alternate strokes of extensibly move said extensible trough, a control valve operable to supply fluid under pressure to either one of said valves and at the same time connect the other of said valves to the return, a hand lever for operating said control valve, and means operable by movement of said hand lever to a-position' to move said control valve into posi-. tion to extensibly or retractibly move said extensible trough, for alternately operating said valves to suppl and release fluid under pressure from said cylinders during reciprocation of the conveyor.

12. In a feeding device for shaker conveyors, a reciprocating trough, an extensible trough, and means for moving said extensible trough relative to said reciprocating trough including two i'riction grip blocks reciprocably moved by one of said troughs and disposed on each side of the other of said troughs for engagement therewith during alternate strokes of the conveyor, a separate cylinder and piston for each set of said grip blocks for moving said grip blocks to a gripping position, a valve operable to supply fluid under 

